CN104637446B - Image element circuit and its driving method and a kind of display device - Google Patents
Image element circuit and its driving method and a kind of display device Download PDFInfo
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- CN104637446B CN104637446B CN201510059758.7A CN201510059758A CN104637446B CN 104637446 B CN104637446 B CN 104637446B CN 201510059758 A CN201510059758 A CN 201510059758A CN 104637446 B CN104637446 B CN 104637446B
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Abstract
A kind of image element circuit and its driving method are provided, in initial phase, third transistor conducting initializes each electrode potential of second transistor；In programming phases, the threshold voltage and data-signal of second transistor are stored in storage capacitance, and the threshold voltage can characterize the threshold voltage of driving transistor；In glow phase, driving transistor produces driving current according to the pressure differential at storage capacitance two ends, and drives light-emitting component to light.Because second transistor is as being positioned proximate in image element circuit residing for driving transistor and grid voltage, source voltage is consistent lighting, second transistor be capable of mirror image driving transistor it is initial when threshold voltage and its use rear threshold voltage shift situation, and the threshold voltage is stored by storage capacitance in programming phases, so as to the threshold voltage of glow phase compensation for drive transistor is uneven or the problem of threshold voltage shift.Additionally provide a kind of display device.
Description
Technical field
The application is related to display device field, and in particular to a kind of image element circuit and its driving method and a kind of display dress
Put.
Background technology
Organic Light Emitting Diode (Organic Light-Emitting Diode, OLED) display is because with high brightness, height
It is the advantages of luminous efficiency, wide viewing angle and low-power consumption, widely studied by people in recent years, and be applied to rapidly a new generation display work as
In.The type of drive that OLED is shown can be passive waked-up (Passive Matrix OLED, PMOLED) and active matrix
Two kinds of driving (Active Matrix OLED, AMOLED).Passive waked-up is although with low cost, but there is cross-talk
Phenomenon can not realize high-resolution display, and passive waked-up electric current is big, reduces OLED service life.Compared to it
Under, driven with active matrix mode sets the different transistor of number as current source on each pixel, it is to avoid cross-talk,
Required driving current is smaller, and power consumption is relatively low, makes OLED life-span and increases, it is possible to achieve high-resolution display, meanwhile, active square
The need for battle array driving is easier to meet large area and high grade grey level is shown.
Traditional AMOLED image element circuit be simple two TFT (Thin Film Transistor,
TFT) structure, as shown in figure 1, this circuit is although simple in construction, but is unable to compensation for drive transistor T1 and OLED threshold value electricity
Pressure drift causes the threshold voltage inhomogeneities of panel TFT devices everywhere because TFT devices are made of polycrystalline material.Work as drive
When drift or inconsistent value on panel everywhere occur for dynamic transistor T1 threshold voltages, OLED threshold voltages, driving current IDS
Will change, and pixel different on panel because the different drift situations of bias voltage it is also different, so will result in face
The inhomogeneities that plate is shown.
Therefore, at present, in order to solve the V of TFT devicesTHThe problem of uneven or drift is brought, no matter
AMOLED image element circuit adopts the technology that polysilicon (poly-Si) technology, non-crystalline silicon (a-Si) technology or oxide half
Conductor technology, it is required for providing V when constituting image element circuitTHCompensation mechanism.What is proposed at present compensates in pixel
Method be broadly divided into two kinds of current mode and voltage-type.The compensation precision of current mode image element circuit is higher, but needs one
Long setup time, in the case of particularly there is very big parasitic capacitance on low current and data wire.This point
Seriously limit application of the current mode image element circuit in large area, high resolution display.Voltage-type image element circuit is compensated
Precision does not have the height of current mode image element circuit, and circuit structure or/and drive signal are typically relative complex, but actuating speed is fast.
How preferably to sense uneven and property or the drift of driving transistor T1 threshold voltages and it is compensated, to reduce threshold value
Display caused by voltage is uneven as urgent problem to be solved.
The content of the invention
The application provides a kind of image element circuit and its driving method and a kind of display device, with the threshold of compensation for drive transistor
The inhomogeneities or threshold voltage shift of threshold voltage.
According to the application's in a first aspect, a kind of image element circuit is provided in a kind of embodiment, for being arranged in by first party
To arrangement be used for provide scanning signal scan line and by second direction arrange be used for provide data-signal data wire it
Between, including：Driving transistor, light-emitting component, storage capacitance, second transistor, third transistor, the 4th transistor, the 5th crystalline substance
Body pipe and the 6th transistor, wherein,
The control pole of driving transistor is coupled to the control pole of second transistor, and the second pole of driving transistor is coupled to hair
Second end of optical element；First pole of driving transistor is used to be coupled to the first level terminal, and the first end of light-emitting component is used for coupling
It is bonded to second electrical level end；The first end of storage capacitance is coupled to the control pole of driving transistor, the second end coupling of storage capacitance
To the first pole of driving transistor；First pole of second transistor is coupled to the second pole of third transistor, second transistor
Second pole is coupled to the first pole of the 6th transistor；First pole of third transistor is coupled to the second pole of driving transistor, the
The control pole of three transistors is used to be coupled to scan line；The control pole of 4th transistor is used to be coupled to scan line, the 4th crystal
First pole of pipe is used to be coupled to data wire, and the second pole of the 4th transistor is coupled to the first pole of the 6th transistor；5th is brilliant
First pole of body pipe is coupled to the first pole of second transistor, and the second pole of the 5th transistor is coupled to the control of second transistor
Pole, the control pole of the 5th transistor is used to be coupled to scan line；The control pole of 6th transistor is used to be coupled to scan line, the 6th
Second pole of transistor is coupled to the first pole of driving transistor.
According to second aspect, a kind of display device is provided in a kind of embodiment, including：
Image element circuit matrix, the image element circuit matrix includes the above-mentioned image element circuit for being arranged in n row m column matrix, the n
It is the integer more than 0 with m；Gate driving circuit, for producing scanning pulse signal, and each row by being formed in the first direction
Scan line provides scan control signal to image element circuit；Data drive circuit, the data voltage of half-tone information is represented for producing
Signal, and provide data-signal to image element circuit by each data wire for being formed in a second direction；Controller, for being driven to grid
Dynamic circuit and data drive circuit provide control sequential.
According to the third aspect, a kind of pixel circuit drive method, each driving of image element circuit are provided in a kind of embodiment
Cycle includes initial phase, programming phases and glow phase, and driving method includes：
In initial phase, third transistor and the 5th transistor turns initialize each electrode potential of second transistor；
Programming phases, the 4th transistor turns, the 4th transistor transmission data-signal；Second transistor is according to its threshold voltage and data
The current potential of signal adjusts it and controls electrode potential and be stored in storage capacitance, second transistor control electrode potential include data-signal and
The threshold voltage information of second transistor, the threshold voltage of second transistor can characterize the threshold voltage of driving transistor；
Glow phase, driving transistor produces driving current according to the pressure differential at storage capacitance two ends, and drives light-emitting component to light.
According to the image element circuit of above-described embodiment, because the control pole of second transistor is coupled to the control of driving transistor
Being positioned proximate in pole, the two residing image element circuit, second transistor is capable of the threshold voltage of mirror image driving transistor, and due to
The two each suffered stress situation in end is identical, so second transistor is capable of the drift situation of mirror image drive threshold voltage.Storage electricity
Appearance can store the threshold voltage, so as to the threshold voltage of compensation for drive transistor, can then alleviate because of driving crystal
The problem of pipe threshold voltage is uneven or threshold voltage shift and the display device that causes show uneven.
Brief description of the drawings
Fig. 1 is image element circuit structure schematic diagram in the prior art；
Fig. 2 is a kind of image element circuit structure figure disclosed in the embodiment of the present application one；
Fig. 3 is a kind of working timing figure of the image element circuit of the embodiment of the present application one；
Fig. 4 is a kind of image element circuit structure figure disclosed in the embodiment of the present application two；
Fig. 5 is a kind of working timing figure of the image element circuit of the embodiment of the present application two；
Fig. 6 is a kind of image element circuit structure figure disclosed in the embodiment of the present application three；
Fig. 7 is a kind of working timing figure of the image element circuit of the embodiment of the present application three；
Fig. 8 is a kind of display device structure block diagram for providing in a kind of embodiment.
Embodiment
The present invention is described in further detail below by embodiment combination accompanying drawing.
Some terms are illustrated first：Transistor in the application can be the transistor of any structure, such as double
Bipolar transistor (BJT) or field-effect transistor (FET).When transistor is bipolar transistor, its control pole refers to double
The base stage of bipolar transistor, first extremely can be the colelctor electrode or emitter stage of bipolar transistor, and corresponding second extremely can be
The emitter stage or colelctor electrode of bipolar transistor, in actual application, " emitter stage " and " colelctor electrode " can be with basis signal
Flow to and exchange；When transistor is field-effect transistor, its control pole refers to the grid of field-effect transistor, and the first pole can be with
Drain electrode or source electrode for field-effect transistor, corresponding second extremely can be source electrode or the drain electrode of field-effect transistor, in reality
In application process, " source electrode " and " drain electrode " can be so that basis signal is flowed to and is exchanged.Transistor in display is usually a kind of field
Effect transistor：Thin film transistor (TFT) (TFT).The application is done specifically so that transistor is field-effect transistor as an example below
Bright, transistor can also be bipolar transistor in other embodiments.
Light-emitting component is Organic Light Emitting Diode (Organic Light-Emitting Diode, OLED), in other realities
Apply in example or other light-emitting components.The first end of light-emitting component can be negative electrode or anode, and correspondingly, then light member
Second end of part is male or female.It should be understood by those skilled in the art that：Electric current should flow to negative electrode from the anode of light-emitting component,
Therefore, the flow direction based on electric current, it may be determined that the anode and negative electrode of light-emitting component.
It is overlapping to refer to that two paths of signals, in the same time all in significant level state, therefore, is not overlapped as two at least in a certain phase
At the time of road signal is not co-located on significant level state.
Significant level can be high level or low level, in the present embodiment, in situation about not being specifically noted
Under, significant level is high level.
First level terminal and second electrical level end are the both ends of power provided that worked by image element circuit.In a kind of embodiment
In, the first level terminal can be high level end VDD, second electrical level end is low level end VSSOr ground wire, in other embodiments,
Can adaptively it replace.It should be noted that：For image element circuit, the first level terminal (such as high level end VDD) and
Second electrical level end (such as low level end VSS) not the application image element circuit a part, in order that those skilled in the art are more preferable
Ground understands the technical scheme of the application, and is specifically incorporated the first level terminal and second electrical level end is described by.
It should be noted that for convenience, being more clearly understood that the application's also for those skilled in the art are made
First node A, Section Point B and the 3rd node C is introduced in technical scheme, present specification to carry out circuit structure relevant portion
Mark, it is impossible to regard as the terminal additionally introduced in circuit.
Embodiment one：
Fig. 2 is refer to, is a kind of image element circuit structure figure disclosed in the present embodiment, the image element circuit is used to being arranged in by the
The scan line for being used to provide scanning signal of one direction arrangement and the data for being used to provide data-signal arranged by second direction
Between line, in the present embodiment, the first level terminal is low level end VSSOr ground wire, second electrical level end is high level end VDD, the picture
Plain circuit includes：Driving transistor T1, light-emitting component OLED, storage capacitance Cs, second transistor T2, third transistor T3,
Four transistor T4, the 5th transistor T5 and the 6th transistor T6, wherein,
Driving transistor T1 control pole is coupled to second transistor T2 control pole, as shown in Fig. 2 switching node is the
One node A；Driving transistor T1 the second pole is coupled to light-emitting component OLED the second end；Light-emitting component OLED first end is used
In coupled to high level end VDD, driving transistor T1 the first pole is used to be coupled to low level end VSS.In the present embodiment, send out
Optical element OLED first end is anode, and the second end is negative electrode.
Storage capacitance Cs first end is coupled to driving transistor T1 control pole, and storage capacitance Cs the second end is coupled to
Driving transistor T1 the first pole.
Second transistor T2 the first pole is coupled to third transistor T3 the second pole, as shown in Fig. 2 switching node is the
Three node C；Second transistor T2 the second pole is coupled to the 6th transistor T6 the first pole, as shown in Fig. 2 switching node is the
Two node B.
Third transistor T3 the first pole is coupled to driving transistor T1 the second pole, and third transistor T3 control pole is used
In coupled to scan line.
4th transistor T4 control pole is used to be coupled to scan line, and the 4th transistor T4 the first pole is used for coupled to number
According to line, the 4th transistor T4 the second pole is coupled to the 6th transistor T6 the first pole.
5th transistor T5 the first pole is coupled to second transistor T2 the first pole, the 5th transistor T5 the second pole coupling
Second transistor T2 control pole is bonded to, the 5th transistor T5 control pole is used to be coupled to scan line.
6th transistor T6 control pole is used to be coupled to scan line, and the 6th transistor T6 the second pole is brilliant coupled to driving
Body pipe T1 the first pole.
In the present embodiment, each transistor is preferably N-channel thin film transistor (TFT), and the significant level of each transistor turns is height
Level.
In a particular embodiment, data wire is used to provide data-signal VDATA.Scan line is swept including the first scan line, second
Retouch line, three scan line and the 4th scan line.First scan line, the second scan line, three scan line and the 4th scan line difference
Transmit the first signal Pre, LED control signal EM, scanning signal Scan and initializing signal Ini.It refer to Fig. 2, the 5th crystal
Pipe T5 control pole is used to be coupled to the first scan line, for inputting the first signal Pre；6th transistor T6 control pole is used for
Coupled to the second scan line, for inputting LED control signal EM；4th transistor T4 control pole is used to sweep coupled to the 3rd
Line is retouched, for inputting scanning signal Scan；Third transistor T3 control pole is used to be coupled to the 4th scan line, for inputting just
Beginningization signal Ini.The signal inversion that the signal and the second scan line that first scan line is transmitted are transmitted, i.e. the first signal Pre
It is anti-phase with LED control signal EM；The signal inversion that the signal and the 4th scan line that three scan line is transmitted are transmitted, that is, sweep
Retouch signal Scan and initializing signal Ini is anti-phase.
In the present embodiment, three scan line transmits the arrival time lag of the significant level of signal in the first scan line institute
Transmit the arrival time of the significant level of signal, i.e. initializing signal Ini significant level, scanning signal Scan significant level
Arrived successively with LED control signal EM significant level.
The image element circuit driving process of the present embodiment is divided into initial phase, programming phases and glow phase, as shown in Figure 3
For the signal sequence of the present embodiment, the driving process of the present embodiment is specifically described with reference to Fig. 2 and Fig. 3.It is effectively electric in the present embodiment
Put down as high level.
In initial phase：High level end VDDHigh level V is providedH, the first signal Pre and initializing signal Ini are high electricity
Flat, scanning signal Scan and LED control signal EM are low level.Now, third transistor T3 and the 5th transistor T5 is in and led
Logical state, the 4th transistor T4 and the 6th transistor T6 are in cut-off state.5th transistor T5 of conducting is by second transistor
T2 connects into diode, connects first node A and the 3rd node C, the first node A and the 3rd node C of connection are by leading
Logical third transistor T3 is by high level end VDDCharge to VH-VOLED, wherein, VOLEDFor light-emitting component OLED two ends pressure drops.Complete
The initialization of each node potential, that is, complete second transistor T2 control pole, the first pole and the second pole current potential it is initial
Change.
In programming phases：First signal Pre continues to high level, and LED control signal EM continues to low level, swept
Retouch signal Scan and be changed into high level, initializing signal Ini is changed into low level.Now, third transistor T3 and the 6th transistor T6
In cut-off state, the 4th transistor T4 and the 5th transistor T5 are in the conduction state.Second transistor T2 passes through the 5th crystal
Pipe T5 connects into diode；Data-signal VDATASection Point B is written to by the 4th transistor T4 of conducting so that the
Two node B voltage is changed into VDATA, at the same time, the second transistor T2 of diode type of attachment is still in the conduction state, its
The current potential of second transistor T2 control poles (grid) is adjusted according to the threshold voltage of itself and Section Point B current potential (i.e.
First node A current potential), in the present embodiment, second transistor T2 control poles (grid) are adjusted by being discharged to data wire
First node A current potential, i.e., discharged from the second transistor T2 and the 4th transistor T4 of conducting, first node A current potential
Slowly reduce, until the current potential of the node is reduced to VDATA+VTH2When, second transistor T2 can enter cut-off state, now, the
One node A current potential maintains VDATA+VTH2, wherein VTH2For second transistor T2 threshold voltage.After programming phases terminate, the
Two-transistor T2 threshold voltage information and data-signal VDATAIt is stored in electric capacity CSIn.It should be noted that in programming rank
At the end of section, the 3rd node C current potential is roughly the same with first node A current potential.
In glow phase：First signal Pre and scanning signal Scan are changed into low level, initializing signal Ini and luminous control
Signal EM processed is changed into high level.Now, the 4th transistor T4 and the 5th transistor T5 are placed in cut-off state, third transistor T3
Conducting state is placed in the 6th transistor T6, Section Point B is coupled to low level end V by the 6th transistor T6 of conductingSS,
Driving transistor T1 the first pole and Section Point B current potential are set to zero, and the electric current for flowing through light-emitting component OLED is：
Wherein, IDSTo flow through light-emitting component OLED electric current, VGS_T1For between driving transistor T1 control poles and the first pole
Potential difference, VTH1And VTH2Driving transistor T1 and second transistor T2 threshold voltage, μ are represented respectivelyn、Cox, W, L be respectively
Driving transistor T1 effective mobility, unit area gate capacitance, channel width and channel length.Due to driving transistor T1 and
Second transistor T2 closes on the position in image element circuit, also, the voltage difference between grid and source electrode is one when luminous
Sample, it is preferable that additionally use identical technique, it is therefore contemplated that both threshold voltages are equal, i.e. VTH2=VTH1,
Then, formula (1-1) can abbreviation be：
Formula (1-2) shows, flows through light-emitting component OLED electric current and driving transistor T1 threshold voltage VTHIt is unrelated, because
Light-emitting component OLED is positioned over driving transistor T1 the second pole (for example draining) and high level end VDDBetween, so flowing through luminous
Element OLED electric current and light-emitting component OLED threshold voltage are also unrelated, so as to compensation well because threshold voltage drift
Move the display inhomogeneities caused.
The image element circuit of the present embodiment extracts threshold voltage using mirror image pipe (second transistor T2), on the one hand passes through design
Image element circuit structure makes mirror image pipe be under identical bias condition, so as to more accurately realize the equivalent replacement of threshold voltage；Separately
On the one hand there is multiple transistor, influence driving on the luminous branch road for avoiding driving transistor T1 and light-emitting component OLED compositions
Ability；Another further aspect, light-emitting component OLED is positioned over close to high level end VDD, required data voltage is smaller.
In addition, storage capacitance C in image element circuit in the present embodimentSOne end be connected to driving transistor T1 control
Pole, the other end may be coupled to low level end VSS, can be connected to high level end VDD, light-emitting component OLED can be positioned over drive
The drain terminal of dynamic transistor, can also be positioned over source, and driving process is also identical with the driving process of the present embodiment, no longer goes to live in the household of one's in-laws on getting married herein
State.
Embodiment two：
Unlike the embodiments above, in image element circuit disclosed in the present embodiment, each transistor is P-channel thin film transistor (TFT),
The significant level of each transistor turns is low level.Fig. 4 is refer to, is a kind of image element circuit structure figure disclosed in the present embodiment.
Driving transistor T1 control pole is coupled to second transistor T2 control pole, and switching node is first node A；Drive
Dynamic transistor T1 the second pole is coupled to light-emitting component OLED the second end；Light-emitting component OLED first end is used for coupled to low
Level terminal VSS, driving transistor T1 the first pole is used to be coupled to high level end VDD.In the present embodiment, light-emitting component OLED
First end be negative electrode, the second end be anode.
Storage capacitance Cs first end is coupled to driving transistor T1 control pole, and storage capacitance Cs the second end is coupled to
Driving transistor T1 the first pole.
Second transistor T2 the first pole is coupled to third transistor T3 the second pole, and switching node is the 3rd node C；The
Two-transistor T2 the second pole is coupled to the 6th transistor T6 the first pole, and switching node is Section Point B.
Third transistor T3 the first pole is coupled to driving transistor T1 the second pole, and third transistor T3 control pole is used
In coupled to scan line.
4th transistor T4 control pole is used to be coupled to scan line, and the 4th transistor T4 the first pole is used for coupled to number
According to line, the 4th transistor T4 the second pole is coupled to the 6th transistor T6 the first pole.
5th transistor T5 the first pole is coupled to second transistor T2 the first pole, the 5th transistor T5 the second pole coupling
Second transistor T2 control pole is bonded to, the 5th transistor T5 control pole is used to be coupled to scan line.
6th transistor T6 control pole is used to be coupled to scan line, and the 6th transistor T6 the second pole is brilliant coupled to driving
Body pipe T1 the first pole.
In the present embodiment, the first level terminal is high level end VDD, second electrical level end is low level end VSS.Image element circuit
Driving process is divided into initial phase, programming phases and glow phase, refer to Fig. 5, is the signal sequence of the present embodiment, with reference to
Fig. 4 and Fig. 5 specifically describe the driving process of the present embodiment.In the present embodiment, significant level is low level.
In initial phase：First signal Pre and initializing signal Ini is low level, scanning signal Scan and luminous control
Signal EM processed is high level.Now, third transistor T3 and the 5th transistor T5 are in the conduction state, the 4th transistor T4 and
Six transistor T6 are in cut-off state.Second transistor T2 is connected into diode by the 5th transistor T5 of conducting, is connected
First node A and the 3rd node C, the first node A and the 3rd node C of connection are discharged to by the third transistor T3 of conducting
VOLED, wherein, VOLEDFor light-emitting component OLED two ends pressure drops.The initialization of each node potential is completed, that is, completes second transistor
The initialization of the current potential of T2 control pole, the first pole and the second pole.
In programming phases：First signal Pre continues to low level, and LED control signal EM continues to high level, swept
Retouch signal Scan and be changed into low level, initializing signal Ini is changed into high level.Now, third transistor T3 and the 6th transistor T6
In cut-off state, the 4th transistor T4 and the 5th transistor T5 are in the conduction state.Second transistor T2 passes through the 5th crystal
Pipe T5 connects into diode；Data-signal VDATASection Point B is written to by the 4th transistor T4 of conducting so that the
Two node B voltage is changed into VDATA, at the same time, the second transistor T2 of diode type of attachment is still in the conduction state, its
The current potential (i.e. first node A current potential) of second transistor T2 control poles (grid) is adjusted according to Section Point B current potential,
In the present embodiment, the data-signal that second transistor T2 control poles (grid) are provided by the threshold voltage and data wire of itself
VDATACharge with adjusting first node A current potential, first node A current potential is slowly raised, until the current potential of the node is increased to
VDATA+VTH2When, second transistor T2 can enter cut-off state, and now, first node A current potential maintains VDATA+VTH2, wherein
VTH2For second transistor T2 threshold voltage.After programming phases terminate, second transistor T2 threshold voltage information sum it is believed that
Number VDATAIt is stored in electric capacity CSIn.It should be noted that at the end of programming phases, the 3rd node C current potential and first segment
Point A current potential is roughly the same.
In glow phase：First signal Pre and scanning signal Scan are changed into high level, initializing signal Ini and luminous control
Signal EM processed is changed into low level.Now, the 4th transistor T4 and the 5th transistor T5 are placed in cut-off state, third transistor T3
Conducting state is placed in the 6th transistor T6, Section Point B is coupled to high level end V by the 6th transistor T6 of conductingDD,
Driving transistor T1 the first pole and Section Point B current potential are set to high level VH, the electric current for flowing through light-emitting component OLED is：
Wherein, IDSTo flow through light-emitting component OLED electric current, VGS_T1For between driving transistor T1 control poles and the first pole
Potential difference, VTH1And VTH2Driving transistor T1 and second transistor T2 threshold voltage, μ are represented respectivelyn、Cox, W, L be respectively
Driving transistor T1 effective mobility, unit area gate capacitance, channel width and channel length.Due to driving transistor T1 and
Second transistor T2 closes on the position in image element circuit, also, the voltage difference between grid and source electrode is one when luminous
Sample, it is preferable that additionally use identical technique, it is therefore contemplated that both threshold voltages are equal, i.e. VTH2=VTH1,
Then, formula (2-1) can abbreviation be：
Formula (2-2) shows, flows through light-emitting component OLED electric current and driving transistor T1 threshold voltage VTHIt is unrelated, because
Light-emitting component OLED is positioned over driving transistor T1 the second pole and low level end VSSBetween, so flowing through light-emitting component OLED's
Electric current and light-emitting component OLED threshold voltage are also unrelated, so as to compensation well because of showing that threshold voltage shift is caused
Show inhomogeneities.
Embodiment three：
Fig. 6 is refer to, is a kind of image element circuit structure figure disclosed in the present embodiment, is with the difference of embodiment two,
In the present embodiment image element circuit, driving transistor T1 and second transistor T2 are P-channel thin film transistor (TFT), third transistor T3,
4th transistor T4, the 5th transistor T5 and the 6th transistor T6 are N-channel thin film transistor (TFT).Driving transistor T1 and second
The significant level of transistor T2 conductings is low level；Third transistor T3, the 4th transistor T4, the 5th transistor T5 and the 6th are brilliant
The significant level of body pipe T6 conductings is high level.
Driving transistor T1 control pole is coupled to second transistor T2 control pole, and switching node is first node A；Drive
Dynamic transistor T1 the second pole is coupled to light-emitting component OLED the second end；Light-emitting component OLED first end is paramount for coupling
Level terminal VDD, driving transistor T1 the first pole is used to be coupled to low level end VSS.In the present embodiment, light-emitting component OLED
First end be anode, the second end be negative electrode.
Storage capacitance Cs first end is coupled to driving transistor T1 control pole, and storage capacitance Cs the second end is coupled to
Driving transistor T1 the first pole.
Second transistor T2 the first pole is coupled to third transistor T3 the second pole, and switching node is the 3rd node C；The
Two-transistor T2 the second pole is coupled to the 6th transistor T6 the first pole, and switching node is Section Point B.
Third transistor T3 the first pole is coupled to driving transistor T1 the second pole, and third transistor T3 control pole is used
In coupled to scan line.
4th transistor T4 control pole is used to be coupled to scan line, and the 4th transistor T4 the first pole is used for coupled to number
According to line, the 4th transistor T4 the second pole is coupled to the 6th transistor T6 the first pole.
5th transistor T5 the first pole is coupled to second transistor T2 the first pole, the 5th transistor T5 the second pole coupling
Second transistor T2 control pole is bonded to, the 5th transistor T5 control pole is used to be coupled to scan line.
6th transistor T6 control pole is used to be coupled to scan line, and the 6th transistor T6 the second pole is brilliant coupled to driving
Body pipe T1 the first pole.
In the present embodiment, second electrical level end is high level end VDD, the first level terminal is low level end VSS。
Image element circuit driving process is divided into initial phase, programming phases and glow phase, refer to Fig. 7, is this implementation
The signal sequence of example, the driving process and embodiment two of the image element circuit is similar, is a difference in that third transistor T3, the 4th crystalline substance
The significant level that body pipe T4, the 5th transistor T5 and the 6th transistor T6 are turned on is high level.
In initial phase：First signal Pre and initializing signal Ini is high level, scanning signal Scan and luminous control
Signal EM processed is low level.Now, third transistor T3 and the 5th transistor T5 are in the conduction state, the 4th transistor T4 and
Six transistor T6 are in cut-off state.Second transistor T2 is connected into diode by the 5th transistor T5 of conducting, is connected
First node A and the 3rd node C, the first node A and the 3rd node C of connection are discharged to by the third transistor T3 of conducting
VOLED, wherein, VOLEDFor light-emitting component OLED two ends pressure drops.The initialization of each node potential is completed, that is, completes second transistor
The initialization of the current potential of T2 control pole, the first pole and the second pole.
In programming phases：First signal Pre continues to high level, and LED control signal EM continues to low level, swept
Retouch signal Scan and be changed into high level, initializing signal Ini is changed into low level.Now, third transistor T3 and the 6th transistor T6
In cut-off state, the 4th transistor T4 and the 5th transistor T5 are in the conduction state.Second transistor T2 passes through the 5th crystal
Pipe T5 connects into diode；Data-signal VDATASection Point B is written to by the 4th transistor T4 of conducting so that the
Two node B voltage is changed into VDATA, at the same time, the second transistor T2 of diode type of attachment is still in the conduction state, its
The current potential (i.e. first node A current potential) of second transistor T2 control poles (grid) is adjusted according to Section Point B current potential,
In the present embodiment, the data-signal that second transistor T2 control poles (grid) are provided by the threshold voltage and data wire of itself
VDATACharge with adjusting first node A current potential, first node A current potential is slowly raised, until the current potential of the node is increased to
VDATA+VTH2When, second transistor T2 can enter cut-off state, and now, first node A current potential maintains VDATA+VTH2, wherein
VTH2For second transistor T2 threshold voltage.After programming phases terminate, second transistor T2 threshold voltage information sum it is believed that
Number VDATAIt is stored in electric capacity CSIn.It should be noted that at the end of programming phases, the 3rd node C current potential and first segment
Point A current potential is roughly the same.
In glow phase：First signal Pre and scanning signal Scan are changed into low level, initializing signal Ini and luminous control
Signal EM processed is changed into high level.Now, the 4th transistor T4 and the 5th transistor T5 are placed in cut-off state, third transistor T3
Conducting state is placed in the 6th transistor T6, Section Point B is coupled to high level end V by the 6th transistor T6 of conductingDD,
Driving transistor T1 the first pole and Section Point B current potential are set to high level VH, the electric current for flowing through light-emitting component OLED is：
Wherein, IDSTo flow through light-emitting component OLED electric current, VGS_T1For between driving transistor T1 control poles and the first pole
Potential difference, VTH1And VTH2Driving transistor T1 and second transistor T2 threshold voltage, μ are represented respectivelyn、Cox, W, L be respectively
Driving transistor T1 effective mobility, unit area gate capacitance, channel width and channel length.Due to driving transistor T1 and
Second transistor T2 closes on the position in image element circuit, also, the voltage difference between grid and source electrode is one when luminous
Sample, it is preferable that additionally use identical technique, it is therefore contemplated that both threshold voltages are equal, i.e. VTH2=VTH1,
Then, formula (3-1) can abbreviation be：
Formula (3-2) shows, flows through light-emitting component OLED electric current and driving transistor T1 threshold voltage VTHIt is unrelated, because
Light-emitting component OLED is positioned over driving transistor T1 the second pole and low level end VSSBetween, so flowing through light-emitting component OLED's
Electric current and light-emitting component OLED threshold voltage are also unrelated, so as to compensation well because of showing that threshold voltage shift is caused
Show inhomogeneities.
Example IV：
The present embodiment also discloses a kind of display device, refer to Fig. 8, is the also disclosed display device structure of the present embodiment
Schematic diagram, the display device includes：
Display panel 100, display panel 100 includes being arranged in the image element circuit that above-described embodiment of n row m column matrix is provided
Pixel [1] [1] ... Pixel [n] [m], wherein, n and m are the integer more than 0, and Pixel [n] [m] characterizes the picture of line n m row
Plain circuit；The multi-strip scanning line Gate [1] ... Gate [n] for the first direction (such as horizontal) being connected with each pixel, wherein,
Gate [n] represents the corresponding scan line of line n image element circuit, for providing scan control letter to offer to one's own profession image element circuit
Number, such as scanning signal Scan, LED control signal EM, initializing signal Ini and the first signal Pre；With second direction (for example
A plurality of data lines Data [1] ... Data [m] longitudinally), wherein, Data [m] represents the corresponding data of m row image element circuits
Line, the data-signal V for providing each image element circuitDATA.Display panel can be liquid crystal display panel, organic light emitting display face
Plate, electronic paper display panel etc., and corresponding display device can be liquid crystal display, OLED, Electronic Paper show
Show device etc..
Gate driving circuit 200, for producing scanning pulse signal, and each horizontal scanning line by being formed in the first direction
Gate [1] ... Gate [n] provide scan control signal to image element circuit.Gate driving circuit 200 can be by welding with showing
Show that panel 100 is connected or is integrated in display panel 100.
Data drive circuit 300, it is right with it in display panel 100 that the signal output part of data drive circuit 300 is coupled to
On the data wire Data [1] ... Data [m] answered, the data voltage signal V that data drive circuit 300 is producedDATAPass through data
Line Data [1] ... Data [m] are transferred in corresponding pixel cell to realize gradation of image.Data drive circuit 300 can be with
It is connected or is integrated in display panel 100 with display panel 100 by welding.
Controller 400, controller 400 is used to provide control sequential to gate driving circuit and data drive circuit.
It should be noted that in some embodiments, the first signal Pre and LED control signal EM and scanning signal
Scan and initializing signal Ini are respectively two groups of inversion signals, therefore, it can the same signal output by gate driving circuit
End provides the two paths of signals in one group, another road signal in the group is carried out anti-phase.
It should be noted that in a particular embodiment, although need to maintain and initial in glow phase initializing signal Ini
Change stage same level (such as high level), programming phases beginning with the end of, saltus step occurs for initializing signal Ini,
But, at glow phase initial stage, initializing signal Ini level (high or low) on the luminous influence of image element circuit less, also,
The initialization time of image element circuit is very short, and initializing signal Ini has similar waveform with LED control signal EM level.
Therefore, in some embodiments, initializing signal Ini and LED control signal EM can also (such as grid drives by same signal source
The signal output part of dynamic circuit) provide, now need to increase delay link, for example, by the signal output part of gate driving circuit
The signal of output is used to provide LED control signal EM, and increases the output signal appropriate delay link simultaneously, and will prolong
The signal lagged is used to provide initializing signal Ini.
It should be noted that in some embodiments, initializing signal Ini is ahead of scanning signal Scan, and the two-way
The significant level of signal is not overlapped, therefore, and the initializing signal Ini of one's own profession image element circuit believes with the scanning of lastrow image element circuit
Number Scan is provided by same signal source, so as to save signal wire.
Above content is to combine specific embodiment further description made for the present invention, it is impossible to assert this hair
Bright specific implementation is confined to these explanations.For general technical staff of the technical field of the invention, do not taking off
On the premise of from present inventive concept, some simple deduction or replace can also be made.
Claims (8)
1. a kind of image element circuit, the scan line of scanning signal is provided and by second by being used for of arranging of first direction for being arranged in
Between the data wire for providing data-signal of direction arrangement, it is characterised in that the image element circuit includes：Drive crystal
Pipe, light-emitting component, storage capacitance, second transistor, third transistor, the 4th transistor, the 5th transistor and the 6th transistor；
The control pole of driving transistor is coupled to the control pole of second transistor, and the second pole of driving transistor is coupled to luminous member
Second end of part；
First pole of driving transistor is used to be coupled to the first level terminal, and the first end of light-emitting component is used to be coupled to second electrical level
End；
The first end of storage capacitance is coupled to the control pole of driving transistor, and the second end of storage capacitance is coupled to driving transistor
The first pole；
First pole of second transistor is coupled to the second pole of third transistor, and the second pole of second transistor is brilliant coupled to the 6th
First pole of body pipe；
First pole of third transistor is coupled to the second pole of driving transistor, and the control pole of third transistor, which is used to be coupled to, sweeps
Retouch line；
The control pole of 4th transistor is used to be coupled to scan line, and the first pole of the 4th transistor is used to be coupled to data wire, the
Second pole of four transistors is coupled to the first pole of the 6th transistor；
First pole of the 5th transistor is coupled to the first pole of second transistor, and the second pole of the 5th transistor is brilliant coupled to second
The control pole of body pipe, the control pole of the 5th transistor is used to be coupled to scan line；
The control pole of 6th transistor is used to being coupled to scan line, the second pole of the 6th transistor coupled to driving transistor the
One pole；
The scan line includes the first scan line, the second scan line, three scan line and the 4th scan line；
The control pole of 5th transistor is used to be coupled to the first scan line；
The control pole of 6th transistor is used to be coupled to the second scan line；
The control pole of 4th transistor is used to be coupled to three scan line；
The control pole of third transistor is used to be coupled to the 4th scan line.
2. image element circuit as claimed in claim 1, it is characterised in that
The signal inversion that the signal and the second scan line that first scan line is transmitted are transmitted；
The signal inversion that the signal and the 4th scan line that three scan line is transmitted are transmitted；
The arrival time lag that three scan line transmits the significant level of signal transmits the effective of signal in the first scan line
The arrival time of level.
3. image element circuit as claimed in claim 1, it is characterised in that
In initial phase, the 4th transistor and the 6th transistor are respectively by each scanning line traffic control in cut-off state；3rd is brilliant
Body pipe and the 5th transistor respond the significant level conducting that respective scan line is provided respectively, initialize the control of second transistor
The current potential of pole, the first pole and the second pole；
In programming phases, the 4th transistor and the 5th transistor respond the significant level conducting that respective scan line is provided respectively, the
Three transistors and the 6th transistor are respectively by each scanning line traffic control in cut-off state；Current potential of the second transistor based on data wire
The current potential of its control pole is adjusted, and the current potential of second transistor control pole is stored in storage capacitance, second transistor control pole
Current potential can characterize the data-signal that the threshold voltage and data wire of driving transistor are transmitted；
In glow phase, the 4th transistor and the 5th transistor are respectively by each scanning line traffic control in cut-off state；3rd crystal
Pipe and the 6th transistor respond the significant level conducting of its scan line offer, and driving transistor is according to the pressure difference at storage capacitance two ends
Driving produces driving current, and drives light-emitting component to light.
4. the image element circuit as described in claim 1-3 any one, it is characterised in that each transistor is thin film transistor (TFT).
5. image element circuit as claimed in claim 4, it is characterised in that the light-emitting component is organic illuminating element.
6. image element circuit as claimed in claim 5, it is characterised in that
Driving transistor, second transistor, third transistor, the 4th transistor, the 5th transistor and the 6th transistor are N-channel
Thin film transistor (TFT), the significant level of each transistor turns is high level；First level terminal is low level end or ground wire, second electrical level
Hold as high level end；The first end of light-emitting component is anode, and the second end of light-emitting component is negative electrode；Or,
Driving transistor, second transistor, third transistor, the 4th transistor, the 5th transistor and the 6th transistor are P-channel
Thin film transistor (TFT), the significant level of each transistor turns is low level；First level terminal is high level end, and second electrical level end is low
Level terminal or ground wire；The first end of light-emitting component is negative electrode, and the second end of light-emitting component is anode；Or,
Driving transistor and second transistor are P-channel thin film transistor (TFT), and the significant level of conducting is low level；3rd crystal
Pipe, the 4th transistor, the 5th transistor and the 6th transistor are N-channel thin film transistor (TFT), and the significant level of conducting is high level；
First level terminal is high level end, and second electrical level end is low level end or ground wire；The first end of light-emitting component is negative electrode, and light member
Second end of part is anode.
7. a kind of display device, it is characterised in that including：
Image element circuit matrix, the image element circuit matrix include be arranged in n row m column matrix such as claim 1-5 any one
Described image element circuit, the n and m are the integer more than 0；
Gate driving circuit, for producing scanning pulse signal, and by each horizontal scanning line for being formed in the first direction to pixel
Circuit provides scan control signal；
Data drive circuit, the data voltage signal of half-tone information is represented for producing, and each by what is formed in a second direction
Data wire provides data-signal to image element circuit；
Controller, for providing control sequential to gate driving circuit and data drive circuit.
8. a kind of be used for the pixel circuit drive method of the image element circuit as any one of claim 1 to 6, its feature exists
In each drive cycle of the image element circuit includes initial phase, programming phases and glow phase, the driving method bag
Include：
In the initial phase, third transistor and the 5th transistor turns initialize each electrode potential of second transistor；
In the programming phases, the 4th transistor turns, the 4th transistor transmission data-signal；Second transistor is according to its threshold value
The current potential of voltage and data-signal adjusts it and controls electrode potential and be stored in storage capacitance, and second transistor control electrode potential includes
The threshold voltage information of data-signal and second transistor, the threshold voltage of second transistor can characterize the threshold of driving transistor
Threshold voltage；
In the glow phase, driving transistor produces driving current according to the pressure differential at storage capacitance two ends, and drives hair
Optical element lights.
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| CN106297667B (en) | 2016-09-26 | 2017-11-07 | 京东方科技集团股份有限公司 | Image element circuit and its driving method, array base palte and display device |
| CN107886897B (en) * | 2017-11-29 | 2020-06-19 | 武汉天马微电子有限公司 | Pixel circuit and display device |
| CN108806607B (en) * | 2018-04-26 | 2020-04-28 | 北京大学深圳研究生院 | Pixel device and display apparatus |
| CN109767724A (en) | 2019-03-11 | 2019-05-17 | 合肥京东方显示技术有限公司 | Pixel circuit, display panel, display device and image element driving method |
| CN110926508B (en) * | 2019-11-28 | 2021-11-19 | 北京大学深圳研究生院 | Active driving type photoelectric sensor, front end circuit and driving method |
| CN111028767B (en) * | 2019-12-06 | 2021-03-16 | 深圳市华星光电半导体显示技术有限公司 | Pixel circuit and driving method |
| CN110930944B (en) * | 2019-12-13 | 2021-04-13 | 云谷（固安）科技有限公司 | Display panel driving method and display device |
| CN115244609A (en) * | 2020-11-30 | 2022-10-25 | 京东方科技集团股份有限公司 | Pixel circuit, driving method thereof and display device |
| CN112837654A (en) * | 2021-03-22 | 2021-05-25 | 上海天马有机发光显示技术有限公司 | Pixel circuit, driving method thereof, display panel and display device |
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| KR100370286B1 (en) * | 2000-12-29 | 2003-01-29 | 삼성에스디아이 주식회사 | circuit of electroluminescent display pixel for voltage driving |
| JP2004191752A (en) * | 2002-12-12 | 2004-07-08 | Seiko Epson Corp | Electrooptical device, driving method for electrooptical device, and electronic equipment |
| KR100497247B1 (en) * | 2003-04-01 | 2005-06-23 | 삼성에스디아이 주식회사 | Light emitting display device and display panel and driving method thereof |
| KR100560468B1 (en) * | 2003-09-16 | 2006-03-13 | 삼성에스디아이 주식회사 | Image display and display panel thereof |
| TWI272570B (en) * | 2005-12-08 | 2007-02-01 | Chi Mei El Corp | Organic light emitting display and pixel with voltage compensation technique thereof |
| CN102270425B (en) * | 2010-06-01 | 2013-07-03 | 北京大学深圳研究生院 | Pixel circuit and display device |
| CN102280085B (en) * | 2010-06-10 | 2013-09-11 | 元太科技工业股份有限公司 | Pixel drive circuit and method and light-emitting display device |
| CN102290027B (en) * | 2010-06-21 | 2013-10-30 | 北京大学深圳研究生院 | Pixel circuit and display device |
| CN102915703B (en) * | 2012-10-30 | 2014-12-17 | 京东方科技集团股份有限公司 | Pixel driving circuit and driving method thereof |
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